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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{/*设置圆角矩形*/
            width: 200px;
            height: 200px;
            border: 2px green solid;
            /* border-radius:100px; */
            border-radius: 10px 20px 30px 40px;
        }
        a{/*让本来只占一块空间变成占一行空间，让行内元素变成块级元素*/
            display:block;
        }
    </style>
</head>
<body>
    <div></div>
    <a href="#">链接1</a>
    <a href="#">链接2</a>

</body>
</html>